Pipe puller



Sept. 11, 1928.

c. R. EDWARDS PIPE FULLER Original Filed Jan. 17. 1921 to; a 416W abfowws,

Patented Sept. 11, was

CS R. EDWARDS, OF HOUSTON, TEXAS.

PIPE FULLER.

Application filed January 17, 1921, Serial This invention relates to new and useful im rovements in a pipe puller.

ne object of the invention is to provide a device of the character described which is adapted to engage with pipe down in a bore and by means of which the pipe may be withdrawn from-the bore. In drilling operations the drill stem, or other pipe, is sometimes twisted ofi in the bore, and on to account of its inaccessibility it is diflicult to remove the same from the bore. It is the object of this invention to provide an overshot which will readily engage with the twisted ofl' pipe whereby the same may be is pulled out.

- Another object of the invention is to provide a pipe puller which may be readily releasedfrom the pipe.

With the above and other objects in View, theinvention has particular relation to certain novel features of construction, operation and arrangement of parts. an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 is a vertical sectional view of the device, shown in position to pull a pipe from a well bore.

Figure 2 is a vertical sectional view, showing the same in released position.

Figure 3 is a transverse sectional view taken on the line 33 of Figure 1, and Figure 4 shows a sectional view of a shoe employed.

Referring now more particularly to the drawings, the numeral 1 designates a drill stem or other pipe whose joints are connected in the usual manner by means of the coupling 2. This stem or pipe sometimes becomes twisted ofi' in a well bore or is dropped therein and-it is diflicult to remove the same on account of its inaccessibility. The tool for removingthe same will now be described :The numeral 3 designates a tubing to the lower end of which a casing 4 is attached. The lower end of this casing is outwardly flared, as at 5, so as toreadily pass over the upper end of the pipe to be pulled. The. casing is provided with an internal annular shoulder 6 forming a ledge or bearing for the dogs 7. Thelower ends of thesedo s rest on said shoulder and are -slightly;%eveled so that the upper ends of the dogswill' have a tendency to converge toward each other, as shown in Figuresl and -Wardly and engage under said collar.

No. 437,970. Renewed January 30, 1928.

3,'and said dogs are held in place by means of the pins 8 which are anchored in the casing wall and whose ends are formed into enlarged heads 9 which work through aligned bearings 10 in the respective dogs, said dogs thus being anchored loosely in position. The dogs are thus anchored against detachment but have a certain amount of freedom of movement about the bearing pins 8.

In operation the device is let down into the bore, passing over the upper end of the pipe 1 to be pulled. As the device passes over the collar 2, the dogs are held by it in vertical position, but when the collar is passed, the upper ends of said dogs fall in The string of pipe 3 extends to the surface of the ground and when the device is thus engaged on the pipe to be pulled it is then pulled upwardly through any suitable appliance provided. for the purpose, and usually the pipe to be pulled may be thereby withdrawn from the bore. In case it cannot be withdrawn it is then necessary that the puller .be released therefrom. For the purpose of making the device releasable one of the lower corners of each of the dogs, as 11, is rounded ofl", said dog being anchored or pivoted 'to the casing near said rounded ofl? corner, and the diagonally opposite corner 12 of said dog is beveled outwardly. Assuming that the ,tool will be rotated in the clockwise direction, the lower rear corner of Y each dog should be rounded off and the forward upward corner bevelled, as above stated. -In order to release the tool from the pipe, the same is rotated in a clockwise direction. The upper ends of the dogs dragging-against the lower end of the collar will be relatively retarded or moving circumferentially relative to the casing 4:, causing the dogs to revolve about the bearing pins 8 into the position indicated in Figure 2. The bevelled corners 12 of the dogs enand, the tool being thus released from the collar may be readily pulled out.

It is sometimes necessary to use this device in a'large hole, that is, in a hole having a much larger. diameter than the pipe to be pulledand in such case -a' large swedged no nipple 13 is attached to the lower end of the casing 4, as shown in Figure 2. The upper or reduced end of this nipple is threaded into the coupling 14.- and this coupling is threaded onto the reduced outwardly threaded lower end of said casing. This nipple is of a diameter to fit closely within the hole and to engage over the pipe to be pulled and it acts as a centering device to direct the upper end of the pipe into the casing. When this swedged nipple is not used the coupling 14.- is removed and a ring like shoe 15 is'threaded onto the lower end of said casing 4 to protect said lower end, and particularly the threads thereof.

What I claim is 1. A pipe puller, including a casing, a tubing to which said casing is attached, a plurality of releasable dogs within the casing whose lower ends are pivoted thereto, an abutment in the casing, the lower end of each dog being formed to permit it to revolve on said abutment, relative to its pivot, and said dogs being movable radially and cir cumferentially with respect to the casing.

2. A pipe puller, including a casing, a tubin to which the casing isattached, a plurality of dogs pivoted within the casing near their lower ends, and adapted to move radially and circumferentially with respect to the casing, the upper end of each dog being formed with an outwardly beveled inside face.

3. A pipe puller, including a casing, a tubing to which the casing is attached, a plurality of dogs pivoted within the casing near their lower ends, bearings carried by the casing against which the lower ends of the dogs work, each dog having an upper corner formed with an outwardly beveled face and its lower end formed with a diagonally opposite curved bearing surface.

w 4. In a pipe puller, a casing formed with an internal shoulder, a dog pivoted near its lower end within the casing and resting on said shoulder, one upper corner of said dog being beveled and the diagonally opposite lower corner being formed with a curved bearing surface.

5. In a pipe puller, a casing formed with an internal shoulder, a plurality of dogs pivoted near their lower ends within the casin and resting on said shoulder, said dogs lieing of a general rectangular contour, one upper corner of each dog being outwardly beveled and the diagonally opposite lower corner thereof being formed with a curved bearing surface.

6. A pipe puller, including a tubing whose lower end is formed into a casing, an internal shoulder within the casing forming a bearing, a dog pivoted within the casing whose lower end works against said bearing, the upper endof said dog being formed with an outwardly beveled face, and the lower end thereof being formed with a curved bearing surface.

7. A pipe puller including a casing whose lower end is flared, a tubing to which said casing is attached, a plurality of dogs within- 7 the casing, whose lower ends are pivoted thereto, the upper end of each dog being iormed with an outwardly beveled inside ace.

8. A pipe puller including a casing whose lower end is flared, a plurality of dogs pivoted within the casing near their lower ends, the upper ends of said dogs being formed with outwardlybeveled inside faces.

9. An overshot fishing tool for pipes having a dog pivoted therein to move radially and circumferentially relative to the tool and arranged to pass a lateral projection on the pipe to engage the underside of same, said engaging portion having a single out- 1 wardly beveled face.

10. An overshot fishing tool for pipes having a dog pivoted therein and arranged to pass a lateral projection on the pipe to engage the underside of same, said engaging portion having a single outwardly beveled face, an abutment underneath the pivoted end of said dog, the lower end of the dog diagonally opposite the beveled part having a curved bearing surface adapted to bear on said abutment, the outwardly beveled face producing radially motion of the dog, relative to the tool, when rotary motion is imparted to the, overshot.

11. An overshot pipe puller formed to fit in" over and engage with'the pipe and including releasable pipe engaging means having free ends movable both circumferentially and radially with respect to the pipe when the puller is rotated and means for aligning said pipe with said pulling device.

' 12. In an overshot pipe pulling device pivoted releasable means for engaging around the pipe to be pulled, meansfor.

aligning said pipe with the device to permit 1) engagement of the latter with the former, said engaging means having free ends which are free to move circumferentially and radially with respect to the pipe when the device is rotated. V

13. In a pipe puller a casing, a tubing to which said casing is attached, a plurality of dogs pivoted within the casing and having their upper ends free, said free ends being movable, both radially and circumferentially 1am with respect to the casing.

14. An overshot pipe puller including a casing and having a pipe engaging dog pivoted therein near its lower end and having an upper' free end movable radially and circumferentially relative to the casing.

15. In an overshot pipe pulling device, releasable dogs for engaging around the pipe to be pulled, and means for aligning said pipe with said device to permit the engagement of the latter with the former, the upper ends of said dogs having outwardly beveled inside faces.

16. A pipe puller adapted to fit over the pipe to be pulled and including a tubular member, a dog mounted therein whose upper end is adapted to engage under the p pe coupling, means connecting the dog tothe tubular member, said dog being movable circumferentially and radially on said means with respect to the tubular member, and the upper end of the dog having an outwardly dog is moved to clear said collar to permit the upward movement of the puller relative to the pipe.

In testimony whereof I have signed my name to this specification.

CHARLES R. EDWARDS. 

